/*
 * Copyright 2002-2015 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      https://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.springframework.core.serializer.support;

import org.springframework.core.convert.converter.Converter;
import org.springframework.core.serializer.DefaultDeserializer;
import org.springframework.core.serializer.Deserializer;
import org.springframework.util.Assert;

import java.io.ByteArrayInputStream;

/**
 * A {@link Converter} that delegates to a
 * {@link org.springframework.core.serializer.Deserializer}
 * to convert data in a byte array to an object.
 *
 * @author Gary Russell
 * @author Mark Fisher
 * @author Juergen Hoeller
 * @since 3.0.5
 */
public class DeserializingConverter implements Converter<byte[], Object>
{

    private final Deserializer<Object> deserializer;


    /**
     * Create a {@code DeserializingConverter} with default {@link java.io.ObjectInputStream}
     * configuration, using the "latest user-defined ClassLoader".
     *
     * @see DefaultDeserializer#DefaultDeserializer()
     */
    public DeserializingConverter()
    {
        this.deserializer = new DefaultDeserializer();
    }

    /**
     * Create a {@code DeserializingConverter} for using an {@link java.io.ObjectInputStream}
     * with the given {@code ClassLoader}.
     *
     * @see DefaultDeserializer#DefaultDeserializer(ClassLoader)
     * @since 4.2.1
     */
    public DeserializingConverter(ClassLoader classLoader)
    {
        this.deserializer = new DefaultDeserializer(classLoader);
    }

    /**
     * Create a {@code DeserializingConverter} that delegates to the provided {@link Deserializer}.
     */
    public DeserializingConverter(Deserializer<Object> deserializer)
    {
        Assert.notNull(deserializer, "Deserializer must not be null");
        this.deserializer = deserializer;
    }


    @Override
    public Object convert(byte[] source)
    {
        ByteArrayInputStream byteStream = new ByteArrayInputStream(source);
        try
        {
            return this.deserializer.deserialize(byteStream);
        }
        catch (Throwable ex)
        {
            throw new SerializationFailedException(
                    "Failed to deserialize payload. " + "Is the byte array a result of corresponding serialization for " + this.deserializer.getClass()
                            .getSimpleName() + "?", ex);
        }
    }

}
